Accident Details
During the landing roll, the Stinson 108 began a left turn. The pilot applied opposite rudder to counter the turn but was unsuccessful. The airplane departed the runway, struck a ditch, nosed over, and came to rest inverted.
Investigation Findings
Examination of the wreckage revealed that the tailwheel spring clips had disconnected from the tailwheel springs and were stretched and distorted.
Maintenance History
About two weeks before the accident, the owner of the airplane installed a new tailwheel. He elected not to install the tailwheel spring clips provided with the kit, but instead used the clips that were already on the airplane. The owner was not a certificated mechanic, nor did he consult with a mechanic during the installation process.